When you want to design LAN topology, you should consider this switch layer. Cisco switch layer or the others switch brand should pay attention about this. The hierarchical design model includes the following 3 layer switch:
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Access Switch
It Provides switch that directly connected to user or workgroup. The main purpose of an access layer switch is to allow end user connect to network. This layer operates at Layer 2 switch. You can put non manageable switch in here. But Cisco Topology recommend catalyst 1900 series , catalyst 2960 series, catalyst 4000 series, catalyst 5000 series
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Distribution Switch
It Provides policy based connectivity. The main purpose of this layer is to give boundary definition in which packet manipulation can take place. Broadcast domains are segmented in this layer with Access List can be configured with your own policy. This layer operates in Layer 2 and Layer 3 switch. The other functions of this layer are VLAN routing, security, and any media transition that need to be occur like fiber optics, UTP cable or STP cable. Cisco recommends catalyst 5000 series and catalyst 6000 series for this layer.
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Core Switch
It Provides optimal data transport between sites. This layer also called backbone. You can put router here when you don’t have associated router module. Packet manipulation like Access List can make slow switching packet. Remember, Access List configuration was put on distribution switch. When you provide core infrastructure with redundant alternate paths gives stability to the network in the event of single device damage. Cisco recommends catalyst 6500 series, 8500 series, IGX 8400 series.
Factors such as need, cost, and performance should be considered before a choice is made. And it’s your job as a network administrator to calculate cost, network design which suitable for your place.
